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The humidifier should turn on and off with the blower motor of the Furnace. This can be done by wiring the the humidifier to the HUM terminal on the furnace control board and then stepping down the power with a transformer. If the humidifier has it's own tarnsformer then a current sensing relay can be used by attaching it to the blower motors common wire.
Hello, since this humidifier has a transformer installed with it, you bring one wire from humidifier to Humidistat and then a wire from humidistat to Transformer. You will need a current sensing relay to turn the humidifier on and off with the Furnace cycle. I will attach a link for a wiring diagram for your Humidifier http://docs.electronicaircleaners.com/aprilaire_700a_installation.pdf
No, you need to attach one of the solenoid wires to the red wire and one to the white wire.
So, undo the wire nut with the three wire and hook one of the red or white wirtes to the wire nut with only one wire. Then you sould have a black wire and one of the other red or white wires under each wire nut.
Problem amy be that you now have burned out the transformer that runs your Humidifier. By hooking the red and white wires together you may have shorted that out and killed it.
If you humidifier does not work after hooking it back uo right then you will need to change the transformer.